/**
 * This file is part of aion-lightning <aion-lightning.org>.
 * 
 * aion-lightning is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * aion-lightning is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with aion-lightning.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.aionlightning.chatserver.utils;

import java.util.BitSet;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.ReentrantLock;

/**
 * Simplified version of idfactory
 * 
 * @author ATracer
 */
public class IdFactory
{
	private final BitSet idList = new BitSet();
	private final ReentrantLock lock = new ReentrantLock();
	private AtomicInteger nextMinId = new AtomicInteger(1);
	protected static IdFactory instance = new IdFactory();
	
	public int nextId()
	{
		try
		{
			lock.lock();
			int id = idList.nextClearBit(nextMinId.intValue());
			idList.set(id);
			nextMinId.incrementAndGet();
			return id;
		}
		finally
		{
			lock.unlock();
		}
	}
	
	public static IdFactory getInstance()
	{
		return instance;
	}
}
